This page summarizes information about the selected resource and its origin based on SPASE metadata.
SPASE version 2.0.1
This data set contains magnetic field vectors and tilt angles from the CRRES tri-axial fluxgate magnetometer data. The magnetic field vectors are at 2 s resolution and in the Vehicle Dipole Horizon (VDH) coordinate system. Also included are the magnetic field magnitude and the tilt of the magnetic field in Theta and Phi in the VDH coordinate system.
NASA NSSDC CRRES fluxgate magnetometer experiment details
NASA; Department of Defense-Department of the Air Force (United States); AFRL; Dr. Howard J. Singer; Dr. E. Gary Mullen
| Role | Person | |
|---|---|---|
| 1. | Principal investigator | Dr. Howard J. Singer XML |
| 2. | Principal investigator | Dr. E. Gary Mullen XML |
| 3. | Metadata contact | James M. Weygand XML |
NASA; Department of Defense-Department of the Air Force (United States); AFRL; Dr. Howard J. Singer; Dr. E. Gary Mullen
Time format in data files is: Year-Month-Day Hour Minute Second (YYYY-MM-DDTHH:MM:SS.SSS)
Universal Time columns from left to right are: year month day hour minute sec in the format of yyyy mm dd hh mm ss.
Flag=9999-12-31T23:59:59Z
Universal Time expressed using a 6-column day, month, year, hour, minute, second representation
| Index | Name | Parameter key |
|---|---|---|
| 1 | Year | Year |
| 2 | Month | Month |
| 3 | Day | Day |
| 4 | Hour | Hour |
| 5 | Minute | Minute |
| 6 | Second | Second |
Magnetic field vector for CRRES in Vehicle Dipole Horizon (VDH) coordinates in units of nT
Flags=99999
| Index | Name | Parameter key |
|---|---|---|
| 1 | BX-VDH | Bx |
| 2 | BY-VDH | By |
| 3 | BZ-VDH | Bz |
CRRES fluxgate magnetometer magnitude at 2 s resolution in units of nT.
Flags=99999
Magnetic field angle vector for CRRES in Vehicle Dipole Horizon (VDH) coordinates in units of degrees
Flags=99999
| Index | Name | Parameter key |
|---|---|---|
| 1 | BTHETA | BTHETA |
| 2 | BPHI | BPHI |
SPASE version 2.0.0
The purpose of this experiment was to measure the ambient geomagnetic field and low-frequency variations in that field up to 10 Hz. This measurement was used together with the look angles of the particle experiments (1) to obtain pitch angles of the measured particles, (2) as a diagnostic of global geomagnetic disturbances, (3) as a diagnostic of very low frequency waves in the ambient environment, (4) to provide plasma gyrofrequencies, (5) to measure V x B electric fields, and (6) to provide a secondary source of spacecraft attitude information. Each axis of a triaxial fluxgate magnetometer was sampled 20 times per second in the range of +/- 45,000 nT. The instrument required a large dynamic range to measure fields near perigee where the field was approximately 45,000 nT and in the vicinity of synchronous orbit where the field was approximately 100 nT or less with periodic variations of amplitude down to fractions of 1 nT. Because of the instrument ranges and the 12-bit analog-to-digital converter the least significant bit resolution in each sensor was approximately 20 nT and approximately 0.4 nT at low and high resolutions, respectively. On command, the signal from one axis of the magnetometer could be amplified six times to provide better amplitude resolution at low field strengths near apogee. The improved sensitivity, which permitted the detection of high-frequency, low-amplitude wave signals from this particular axis, was also used to add confidence to the increased accuracy obtained from the other axes by digital averaging. This experiment was part of the SPACERAD project sponsored by AFGL.
Information about the Fluxgate Magnetometer experiment on the CRRES mission.
| Role | Person | |
|---|---|---|
| 1. | Principal investigator | Dr. Howard J. Singer XML |
| 2. | Principal investigator | Dr. E. Gary Mullen XML |
SPASE version 2.2.0
The Combined Release and Radiation Effects Satellite (CRRES) was launched into a geosynchronous transfer orbit (GTO) for a nominal three-year mission to investigate fields, plasmas, and energetic particles inside the Earth's magnetosphere. As part of the CRRES program the SPACERAD (Space Radiation Effects) project, managed by Air Force Geophysics Laboratory, investigated the radiation environment of the inner and outer radiation belts and measured radiation effects on state-of-the-art microelectronics devices. Other magnetospheric, ionospheric, and cosmic ray experiments were included onboard CRRES and supported by NASA or the Office of Naval Research. The chemical release project was managed by NASA/MSFC and utilized the release of chemicals from onboard cannisters at low altitudes near dawn and dusk perigee times and at high altitudes near local midnight. The chemical releases were monitored with optical and radar instrumentation by ground-based observers to measure the bulk properties and movement of the expanding clouds of photo-ionized plasma along field lines after the releases occurred. In order to study the magnetosphere at different local times during the mission, the satellite orbit was designed to precess with respect to the earth-sun line such that the local time at apogee decreased by 2.5 minutes/day from 08:00 (LT) just after launch and returned to this position in nineteen-month cycles. The CRRES spacecraft had the shape of an octagonal prism with solar arrays on the top side. The prism is 1 m high and 3 m between opposite faces. Four of the eight compartments were for the chemical canisters and the other four housed SPACERAD and other experiments. The spacecraft body was spun at 2.2 rpm about a spin axis in the ecliptic plane and kept pointed about 12 degrees ahead of the Sun's apparent motion in celestial coordinates. Pre-launch and in-flight operations were supported by the Space Test and Transportation Program Office of the U.S. Air Force Space Division. Contact with the CRRES spacecraft was lost on October 12, 1991 and was presumed to be due to onboard battery failure.
Information about the CRRES mission
| Role | Person | |
|---|---|---|
| 1. | Project scientist | Dr. Susan Gussenhoven-Shea XML |
| 2. | Project scientist | Dr. David L. Reasoner XML |
SPASE version 2.2.0
SPASE version 2.2.0
SPASE version 2.2.0
SPASE version 2.2.0
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SPASE version 2.2.0
SPASE version 2.0.1
The Virtual Magnetospheric Observatory Data Repository hosted by the Institute of Geophysics and Planetary Physics, University of California, Los Angeles.
The main web page for information concerning data holdings hosted by the Virtual Magnetospheric Observatory Data Repository.
If data downloaded from the VMO Data Repository are used in publication kindly acknowledge the Virtual Magnetospheric Observatory, Institute of Geophysics and Planetary Physics, University of California, Los Angeles for providing access to the data.
| Role | Person | |
|---|---|---|
| 1. | Principal investigator | Raymond J Walker XML |
| 2. | Metadata contact | Lee Frost Bargatze XML |